#4 Check the Skin and Haircoat
To inspect your dog for fleas, turn the dog onto its back and check the best hiding areas. The armpits and groin are two areas that tend to be warm and protected, making them perfect for fleas. The ears are another hiding area for fleas; check for scratching, redness, blood, or dirt. The skin on the belly, groin, or base of the tail, meanwhile, may appear red and bumpy if your dog has fleas. Another tell-tale sign of fleas is hairloss and scabbing.